Burglar alarm and trap.



PATENTED MAR. 14, 1905.

' H. MASKE.

BURGLAR ALARM AND TRAP. APPLICATION FILED PEB.15,1904.

1 1 11 mm Sim Patented March 14, 1905 PAT NT FI E.

I HENRY tiAsirnFor CHICAGO, iLLiXois,

BURGLAR ALARM AND TRAP.

SPECIFICATION forming part of Letters Patent N0. 785,074, dated March 14, 1905.

Application filed February 15, 1904. Serial No. 193,657.

To all mhmrt ff- HMLZ/ concern:

Be it known that I, HENRY MAsKE, aciti-zen of the'United States, residing at Chicago, in the county of Cook and State of. Illinois, have invented a new and useful Burglar Alarm to open the doors or locked against such use x atwill, and other objects which become ap parent from the detailed description to follow. 'Iattain these objects by the mechanism illustrated in the accompanying drawings, in which Figure 1.: is a fragmental planview of a door provided with my invention; Fig. 2 is a central section through the knob on line 2 2 of Fig. 1. Fig.3 is an end view of the knob, partly broken away Fig. 4 is a cross-section on line 44 of Fig. 2 looking in the direction indicated by the arrows, and Fig. 5 isa cross-section on the same line looking in the opposite direction.

Similar reference characters refer to similar parts throughout the several views;

The door 10 is provided with an ordinary lock having a latch 11, which is operated in the usual manner by the squares indle 12 and the knobs 13 and 14. The kno 13 is an ordinary one; but the knob 14, which is designed to be on the inner side of an outside door, is constructed of the shell 15, provided with the sleeve 16 and the bell 17. The bell 17 forms the front side of the knob, and the shell 15 forms the balance of the knob, and on the interior of said knob 14 is a casing 18, containing av spring which is arranged to be wound up by turning the bell 17 through the medium ofthe shaft 19, to which the bell and one end of the. spring is secured. The casing 18 is rigidly secured to the shell 15 by any well-known means, as the lugs and screws 20. WV hen the spring within the casing 18 is wound by turning the bell 17, it tends to quicklyvibrate the hammer or knocker 21 by means of the intervening gear and escapement connections 22, which maybe of any or- 5 5 dinary construction. The hammer 21 when \thus vibrated strikes the bell and causes an alarm. p

The parts as thus far described I consider of ordinary construction and shall not attempt to make claim to the same.

Rotatably mounted within the sleeve 16 l is another sleeve, 23, provided with a square central opening arranged to receive the spindle 12 and secured thereto by the screw 24 in 6 5 the usual manner. The sleeve is provided within the shell 15 with a collar 25,

which is notched at 26 forthe reception of one end of the slidingbar 27. The remaining end of the bar 27 is arranged to be moved into a notch 28, provided in the bushing or escutcheon29, which. is rigidly secured to the door 10. The bar 27is of such len th relative to the escutcheon 29 and the col ar 25 thatwhen its end is in the notch 28 its other end is out of the notch 26, and vice versa, The sleeve 16 is slotted to provide a way in which the bar 27 is guided.-

It will be understood that when the bar 27 is moved so that its end is in the notch 28 So the knob 14 will be'locked to the escutcheon' 29, and thus be prevented from being ro= tated, and when the bar 27 is moved so that its end is in the notch 26 the knob 14 will be locked to the spindle 12, and thus can be used as an ordinary knob to operate the latch 11. I preferably provide a-screw 30 in the bar 27 as a means tomove said bar by the hand.

' Projecting longitudinally from the end of 0 the sleeve'23 Within the knob 14 are twolugs or pins 31, arranged diametrically opposite one another in a horizontal plane. Secured to the casing 18 are two lugs or ears 32, provided with vertically-concentric perforations 5 for the reception of the rod 33, which has a slight vertical movement. The rod 33 is normally held in its raised position by the coiled expanding spring 34, interposed between a lug 32 and a collar 35, secured to the 'mo rod 33. The upper end of the rod 33 is bent so that itsextreme end 36 rests against the under side of an arm 37 of the escapement,

'zontal plate or flange 38 is secured to the rod 33 slightly below, and in thesame vertical plane with the pins 31, which is depressed by one of the pins 31 when the spindle .12 is .rotatedin one direction and by the other pin 31 when'thespindle 12 is rotated in the opposite direction, providing, however, that the knob 14- is locked to the escutcheon 29. When the flange 38. is depressed, the rod 33, to which it is secured, is moved down, and its extreme end 36 is moved away from the arm 37, allowing said arm, and therefore the hammer 21, to be vibrated by the mechanism alreadyreferred to.

From the description it will be seen that the knob 14 can readily and easily be attached to any ordinary door-lock spindle.

All that is required to be done is to remove the ordinary knob, file the notch 28. in the escutch'eon 29, and attach theknob 14.

I prefer to make the notches 28and 26 out of alinement, so that repeated slamming of the. door cannot accidentally move the bar 27 from one position to the other;

In operation when it is desired to use the invention as an ordinary door-knob the bar 27 is movedso'that its end is in the notch 26. When it is desired to use the device as a burglar alarm and trap, the bar 27 ismoved so'that its end is in the notch 28. If While the device is set in thislatter position a thief approaches and turns the outer knob .13, the bell 17 will sound an alarm during the time 1 the knob is being held in a moved position;

but assoon as the knob 13 is returned to its normal position by the ordinary means pro' Will stop ringing. The thief,(we.will presume for the purpose-of describing theinvention) has entered and closed the door after him. Now heis discovered by an occupant of the house. He attempts to open the door and escape but the knob 14 being locked to the. escutcheon 29 the thief cannot escape and is captured.

This device in certain places and at certain times 5is very valuable.

I am not aware that there has ever been before my invention an alarm known or used of this class whichcould be applied to any ordinary square lock-spindle Without in any Way changing or tampering with the lock.

Having fully described my invention,what I claim, and desire to secure by Letters Patent of the United States, is i The combination of a square spindle .a round sleeve secured to one end of said spindle, a notched flange on one end of said sleeve provided with two longitudinally-extending pins; a sleeve .integral witha knob mounted to rotate on said round sleeve, provided with a longitudinal slot; a bolt mounted to slide in said slot; a notch provided on the door to receive the end of said secured in said knob and a'trip-lever con trolling said spring-actuated mechanism arrangedto be moved by said two longitudinally-extending pins.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this 8th day of February, 1904, at Chicago, Illinois.

. HENRY MASKE. Witnesses:

R. J. JAcKER,

M. L. BROWN. 

